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package scala.tools.nsc.interactive
import scala.concurrent.SyncVar
import scala.tools.nsc.util._
import scala.tools.nsc.symtab._
import scala.tools.nsc.ast._
import scala.tools.nsc.reporters._
import scala.tools.nsc.io._
/** Interface of interactive compiler to a client such as an IDE
*/
object REPL extends EvalLoop {
val settings = new Settings()
val comp = new Global(settings, new ConsoleReporter(settings))
def prompt = "> "
/** Commands:
*
* reload file1 ... fileN
* typeat file line col
*
*
*/
def run() {
val reloadResult = new SyncVar[Either[Unit, Throwable]]
val typeatResult = new SyncVar[Either[comp.Tree, Throwable]]
loop { line =>
(line split " ").toList match {
case "reload" :: args =>
comp.askReload(args map toSourceFile, reloadResult)
show(reloadResult)
case List("typeat", file, line, col1, col2) =>
val source = toSourceFile(file)
val linestart = source.lineToOffset(line.toInt)
val pos = comp.rangePos(source, linestart + col1.toInt, linestart + col1.toInt, linestart + col2.toInt)
comp.askTypeAt(pos, typeatResult)
show(typeatResult)
case List("quit") =>
System.exit(1)
case _ =>
println("unrecongized command")
}
}
}
def toSourceFile(name: String) = new BatchSourceFile(new PlainFile(new java.io.File(name)))
def show[T](svar: SyncVar[Either[T, Throwable]]) {
svar.get match {
case Left(result) => println("==> "+result)
case Right(exc/*: Throwable ??*/) => exc.printStackTrace; println("ERROR: "+exc)
}
}
def main(args: Array[String]) {
run()
}
}
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